I have a Sony MP3 player. It has 8 gigabytes with external speakers. My problem is that I can not delete four songs from it. I tried several times to delete them. I even deleted almost all the songs off of it and that didn't help. I also have an Unknown File on my player but when I look at what is on my player, I can not find it. That is where one of the four songs is. I do not understand it. Any ideas on this? I have been having trouble synchronizing songs to it lately Is that related?I would a...